Passport - A document identifying an individual as a citizen of a specific country and attesting to his or her identity and ability to travel freely.

Visa - A document or, more frequently, a stamp in a passport authorizing the bearer to visit a country for specific purposes and for a specific length of time.

Tourist Card - A document issued in lieu of a visa for a short visit to a country. Typically, a tourist card does not require the person to whom it is issued to have a passport.